lkml.org 
[lkml]   [2017]   [Dec]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] sched/rt: Do not do push/pull when there is only one CPU
On Sat, 2 Dec 2017 13:53:31 +0100
Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:

> what about a check next to sched_feat(RT_PUSH_IPI)? I don't know if this
> is a hot path or not (due to bitmap_weight). If it is, then I would
> suggest something like a jump-label which is enabled if more than one
> CPU has been enabled on boot.

Yeah I didn't like that because of the overhead. But I was being
optimistic that the cpu weight function would be a nit to the actual
pull logic. But I have a better plan.

I would like to disable RT_PUSH_IPI, but that's a sched feature and
that is a constant if we build without sched debugging.

v2 coming up.

-- Steve

\
 
 \ /
  Last update: 2017-12-02 18:13    [W:0.056 / U:0.172 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site